After sufficient time has passed fo

After sufficient time has passed for the light source and optical power meter to stabilize, you need to measure the loss of the test jumpers. connect test jumper 1 as shown in figure 33.31. When testing multimode optical ber, test jumper 1 must have a modal controller, and when testing single-mode optical ber a single 30mm loop is required. Record the optical power displayed on the optical power meter. Disconnect test jumper 1 from the optical power meter; then connect test jumper 2 as shown in figure 33.32 and record the optical power displayed on the optical power meter. The loss for test jumper 2 in that direction is the difference between the recorded values.

Remove test jumper 2 and interchange the ends. Take the end that was mating with test
jumper 1 and connect it to the power meter. Mate the other end with test jumper 1. Record the optical power displayed on the optical power meter. The loss for test jumper 2 in that direction is the difference between the recorded values. If either value exceeds a specied limit, test jumper 2 cannot be used for testing the cable plant.